Aerator structure

Claim 1

APPARATUS FOR TREATING WASTE LIQUID AEROBICALLY AND ANAEROBICALLY COMPRISING A TANK HAVING A CLOSED BOTTOM AND UPRIGHT SIDES, A SMALLER COMPARTMENT WITHIN THE TANK HAVING UPRIGHT SIDES SPACED FROM UPRIGHT SIDES OF THE TANK AND HAVING AN OPEN LOWER END SPACED SUBSTANTIALLY ABOVE THE BOTTOM OF THE TANK, AN INLET CONDUIT LEADING FROM THE EXTERIOR OF THE TANK TO THE INTERIOR OF THE COMPARTMENT, AN OUTLET PIPE LEADING FROM THE UPPER PORTION OF THE TANK, MEANS FOR AGITATING AND AERATING THE CONTENTS OF THE COMPARTMENT BEFORE THEY PASS FROMTHE COMPARTMETN THROUGH THE OPEN LOWER END THEREOF, AND A BAG-LIKE MEMBER OF THE FILTER MATERIAL SUSPENDED FROM THE UPPER PORTION OF THE TANK AND SURROUNDING SAID COMPARTMENT AND SPACED FROMTHE SIDE AND BOTTOM OF THE TANK AND RECEIVING THE DISCHARGE FROM THE COMPARTMENT AND FORMING A FLOW-IMPEDING SCREEN BETWEEN THE COMPARTMENT AND SAID OUTLET PIPE TO PREVENT TURBULENCE IN THE FLOW OF LIQUID IN THE TANK.